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A Room-Temperature Ferroelectric Resonant Tunneling Diode
Zhijun Ma1,2, Qi Zhang2,3, Lingling Tao4
1Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 8, 2022
Summary
Ferroelectric modulation of resonant tunneling was achieved in perovskite oxide quantum wells. This breakthrough enables tunable negative differential resistance for future oxide electronics.
Area of Science:
- Quantum electronics
- Solid-state physics
- Materials science
Background:
- Resonant tunneling relies on discrete energy levels in quantum wells (QWs).
- Ferroelectric resonant tunneling diodes (RTDs) use switchable polarization to tune resistance.
Purpose of the Study:
- To report ferroelectric-modulated resonant tunneling and negative differential resistance (NDR) in BaTiO₃/SrRuO₃/BaTiO₃ QW structures.
- To demonstrate room-temperature operation and significant tunability.
Main Methods:
- Fabrication of all-perovskite-oxide BaTiO₃/SrRuO₃/BaTiO₃ quantum well structures.
- Characterization of electrical transport properties, including resonant tunneling and NDR.
- Density functional theory (DFT) calculations to explain the observed phenomena.
Main Results:
- Robust room-temperature ferroelectric-modulated resonant tunneling and NDR observed.
- NDR ratio modulated by approximately 3 orders of magnitude.
- OFF/ON resistance ratio exceeding 2 × 10⁴.
Conclusions:
- The tunable NDR effect is attributed to an energy bandgap driven by electron-electron correlations.
- This work demonstrates the potential for ferroelectric-based quantum-tunneling devices.
- Paves the way for novel oxide electronics applications.
Keywords:
ferroelectricsnegative differential resistancequantum-well structuresresonant tunneling diodesMore Related Videos
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